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POIn VS2010, is it possible to use static_assert to verify an assumption about the offset of a variable from the start of a class?
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2012-07-03T14:51:58.240
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2012-07-03T15:07:14.647
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2012-07-03T15:07:14.647
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Here is a simplified example: <pre><code>class A { enum {OFFSET = 4}; //Due to packing bool m_bool; }; template<class T> class B : public A { MyClass<T> m_class; }; </code></pre> Now supposing that class A can make use of a subset of MyClass's functionality via a base-class of MyClass, what I wish to do is verify an assumption about the location of 'm_class' with respect to an instance of class A. I have tried the following code from within a member-function of class B, but it gives an error ("expected constant expression"): <pre><code>static_assert ((byte *)nullptr + OFFSET == (byte *)&((B<T> *)nullptr)->m_class, "Error 'm_class' incorrectly located!"); </code></pre> Is this simply too ambitious for the current version of the compiler?
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<c++><visual-studio-2010><static-assert>
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In VS2010, is it possible to use static_assert to verify an assumption about the offset of a variable from the start of a class?
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